Sorry! It's their platform and they can kill all third party apps whenever they want to.
I find it extremely risky to build an entire business out of someone else's unofficial API.
To Downvoters: I'm trying to help you here.
Did you not see the top comment about Embrace, Extend, Extinguish tactic that Spotify and many other companies have used for their API's? [0] Similarly, If your app is in trouble [1] and the upstream provider suspends access to the APIs, your business is totally finished, but not if you are a larger company providing the API (Instagram, Facebook, Twitter, etc)
So don't depend or build your entire business on someone else's API. [2]
[0] https://news.ycombinator.com/item?id=32725714
[1] https://arstechnica.com/tech-policy/2021/05/snap-cuts-off-yo...